How U.S. investigators pulled off the largest insider trading investigation in history: Bloomberg has a great play-by-play. Traders “got leaks from company insiders to win a trading edge in the market. In some cases, traders paid cash to their tipsters. In other cases, facilitators who were paid a fee acted as middlemen putting the two groups in touch.” The most desired information? Data on tech companies and med trials. And the profits were substantial to say the least. “Roomy Khan, a former Intel executive, collected [USD 50 mn] while working as a trader.” They were also apparently working in “rings”, occasionally overlapping groups of insiders, traders, and facilitators, which ultimately became their downfall. “Adopting tactics used against mobsters and narcoterrorists, the FBI infiltrated these rings using wiretaps and informants to work their way further up the chain.”